Maintenance
There is no single interval that suits every kitchen. Here is what decides how often your canopy, ducts, exhaust fan and grease filters need cleaning, and how to build a schedule around it.
· 6 min read
Maintenance
7 Signs Your Restaurant Kitchen Exhaust Needs Cleaning
Grease builds up quietly inside canopies, ducts and fans. These seven signs suggest it is time to book an inspection and clean, plus what not to do while you wait.
By Apex Commercial Exhaust · · 5 min read
Key takeaways
- Visible grease, dripping, soiled filters and smoke lingering in the kitchen are common warning signs.
- Overdue cleaning records are a sign on their own, even if the canopy looks clean.
- Some causes, such as fan faults or airflow problems, need a qualified technician, not just cleaning.
- Never enter ducts, climb onto roofs or dismantle operating equipment to investigate.
- Book an assessment so the canopy, ducts, fan and filters can be checked together.
Most grease in a kitchen exhaust system is out of sight. By the time it is obvious on the canopy, more may have built up in the ducts and fan. Watch for these seven signs, and book an assessment if you notice them.
The seven signs your exhaust needs cleaning
01
Grease visible on canopy surfaces
A sticky film or thick deposits on the canopy interior, gutters or extraction openings.
02
Grease dripping from the canopy
Dripping can point to excessive build-up, blocked gutters or soiled filters.
03
Heavily soiled or blocked filters
Filters that look clogged soon after cleaning, or never seem to come clean.
04
Smoke or heat lingering in the kitchen
Poor extraction can have several causes, including contaminated filters or ducts.
05
Residue around the rooftop fan
Grease around the fan housing or discharge area suggests build-up inside the fan.
06
Unusual fan noise or vibration
Grease can contribute, but noise also needs a proper mechanical check.
07
Overdue cleaning records
If you cannot find the last clean date or report, the system is probably due.
What to do next
Book an assessment so the canopy, plenum, ducts, exhaust fan and filters can be looked at together. Within the agreed scope, Apex cleans all accessible and reachable areas of your kitchen exhaust system and can provide before-and-after photos.
Stay safe: never enter ducts, climb onto roofs or dismantle operating equipment to investigate. Work at height carries specific duties in Victoria under the OHS Regulations 2017. If you have an immediate safety concern, address it before continuing to cook.
When cleaning is not the whole answer
Read when you may need a technician as well
Removing grease can support airflow, but a particular improvement cannot be assumed from cleaning alone. Smoke problems can also come from fan faults, airflow imbalance or ventilation design. Noise and vibration can come from wear, loose components or bearing problems. These issues may need a qualified technician to diagnose and correct.
Apex can note visible equipment concerns during cleaning and recommend further specialist servicing where needed.
Frequently asked questions
Why is grease dripping from my commercial kitchen canopy?
Dripping may indicate excessive build-up, contaminated filters, blocked grease collection areas or other maintenance issues. Arrange a professional assessment.
Why is my kitchen exhaust fan not extracting smoke?
Possible causes include blocked filters, contaminated ductwork, fan faults, airflow imbalance or design issues. A qualified technician may be needed to find the cause.
Does kitchen exhaust cleaning reduce fire risk?
Removing accumulated grease reduces a potential fuel source within extraction equipment. Cleaning supports fire risk management but does not remove every possible hazard.
References & further reading
Government, regulator and Standards sources mentioned in this guide (links checked November 2026; requirements can change, so check the current version):
- Fire and Rescue NSW, NSW Rural Fire Service, ACT Fire Brigade and ACT Rural Fire Service, Restaurant fire safety
- Chubb Insurance Australia, Commercial kitchens fire protection fundamentals (risk bulletin)
- Australian Building Codes Board (ABCB), NCC guide: F6D12 Kitchen local exhaust ventilation
Need help with your kitchen exhaust? Apex Commercial Exhaust cleans canopies, exhaust ducts, rooftop fans and grease filters for commercial kitchens across Melbourne and Victoria.
This article is general information only and is not legal, insurance or compliance advice. Requirements for your kitchen depend on your system, building and obligations.
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